JEE Main Chemistry Class 11 Electrochemistry Part 1 Questions

(i)

Al3+

more‌stable

E∘=−1.66

───────▶

Al

E∘=+0.55

◀──────

Al+

Less‌stable

(ii)

Tl3+

Less‌stable

‌‌

E∘=+1.26

───────▶

T1

E∘=−0.34

◀──────

Tl+

more‌stable

Tl+ has negative electrode potential (E∘=−0.34) means, it does not prefer to convert into Tl but reverse must be preferred that's why it is more stable than Tl3+ (E∘=+1.26). In Al,Al3+ is more stable (E∘=−1.66) than Al+ (E∘=+0.55) and also from Tl+ due to more negative value of E∘. Therefore, by comparison it confirms that Tl+ is more stable than Al+.